Update CI workflows for new directory structure

[tomazb]

Summary

The repository has been reorganized with a new directory structure. GitHub Actions workflows in .github/workflows/ need to be updated to reflect these changes.

Changes Required

File Path Updates

• Python files moved from root to src/imageset_generator/
• Tests moved from root to tests/unit/ and tests/smoke/
• Shell scripts moved to scripts/
• Documentation moved to docs/

Specific Workflow Updates

1. test.yml: Update pytest paths and PYTHONPATH
2. quality.yml: Update linting/formatting paths
3. container.yml: Verify Containerfile changes work
4. security.yml: Update scanning paths

Test Command Changes

# Old
pytest test_*.py

# New
PYTHONPATH=src pytest tests/

Context

This was identified during the repo-reorg-cleanup work to keep the PR focused on structural changes.